After recent photo exposés of the Cayman XT (Radeon HD 5870 successor) and Caicos (Radeon HD 5400 series successor), the third, juicy set of pictures exposes the XT variant of Barts reference board (Radeon HD 5770 successor), which will likely go on to become Radeon HD 6770.

While the specifications of the GPU are not known, what we can tell from the pictures is that the card is powered by two 6-pin power connectors, uses 4+1 phase digital PWM circuitry, and looks to have a 256-bit wide memory interface for a near 80~100% increase in memory bandwidth compared to the previous generation. Display outputs include two DVI, one HDMI, and two mini-DisplayPort. There is one CrossFire connector for 2-way CrossFire support. AMD will kickstart its next-generation Radeon graphics series launches later this year. Don't mind the puny looking GPU-cooler, AMD uses it on prototypes. The actual cooler's outline is drawn on the PCB.

this looks to be one hell of a mid range card. My 4890 is starting to get dated rather fast. If a 5770 was roughly about as powerful as a 4870, I can only imagine where this one stands performance wise.

yeah I thought the 5770 sat nicely between the 4870 and 4890, 256 bit memory bus has little to do with it here, the 5770 has been under the driver spotlight for a year now, not to mention it has ample memory bandwidth anyway.